Enhanced photocurrent in c-Si/nc-3C-SiC:H heterojunction solar cell by front antireflection coating and back side silver nanoparticlesEnhanced photocurrent in c-Si/nc-3C-SiC:H heterojunction solar cell by front antireflection coating and back side silver nanoparticlesEnhanced photocurrent in c-Si/nc-3C-SiC:H heterojunction solar cell by front antireflection coating and back side silver nanoparticles